Pancreatic juice has a pH value of _____.
Fill in the blank(s) with correct word
Answer: 8
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The principle behind salt or sugar preservation is to
A) introduce a mechanical barrier to microbial invasion. B) reduce water activity (aw). C) introduce a microbicide in anticipation of contaminating bacteria or fungi. D) accomplish all of the described functions depending on the food being preserved.
What would you expect to observe in a species with a promiscuous mating system?
A. Intrasexual selection is very strong, with larger females. B. Intrasexual selection is very strong, with larger males. C. A female mates with a different male in every breeding season. D. Males remain with females to help raise young. E. Females interfere with any attempts by males to mate with other females.
Which of the following statements is true?
a. Gene mutations occur independently of each other. b. Gene mutations are relatively rare. c. Ionizing radiation causes chromosomal damage and free radical formation. d. Mutations are random; that is, it is impossible to predict exactly when a specific gene will mutate, but an expected frequency can be assigned. e. All of these are true.
Which of the following does not contain a heavy metal?
A. mercurochrome B. zinc C. merthiolate D. silver nitrate solutions E. tincture of iodine